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유동 가스 온도 변화에 따른 삼각 분리 막대형 차압 유량계 특성 연구
김광일(Kwangil Kim),유원열(Wonyuel Yoo),이충훈(Choonghoon Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Differential pressure flow meters which have a shape of triangular separate bar (TSB) were tested for investigating the flow characteristics of the flow meters with varying the temperature of the gas flow. Three kinds of the triangular separate bar flow meters whose aerodynamic angles are different one another are used. The mass flow rate of the flow meters are evaluated using non-dimensional parameter which includes the gas temperature, exhaust gas pressure, the differential pressure at the flow meters and atmospheric pressure. A burner system was used for raising the gas temperature. The burner system was operated with varying the air/fuel ratio by controlling both the fuel injection rate at the fuel nozzle and air flow rate from a blower. An empirical correlation between mass flow rate at the TSB flow meter and the non-dimensional parameter was obtained. The empirical correlation shows linear relationship between the mass flow rate and the non-dimensional parameter H. Also, the mass flow characteristics at the TSB flow meter was affected by the gas temperature.
A Development of Modem ASIC for CDMA Digital Cellular Telephone
Yeon, Kwangil,Eo, Iksoo,Lim, Ingi,Kim, Jaeseok,Kim, Kyungsoo THE RESEARCH INSTITUTE OF ASIC DESIGN YONSEI UNIVE 1996 Journal of the Research Institute of ASIC Design Vol.3 No.1
In this paper, we present a development of modem ASIC for CDMA digital cellular telephone. The modem ASIC integrates CDMA reverse link modulator. CDMA forward link demodulator and Viterbi decoder required for the CDMA baseband digital signal processing. To carry out the system-level simulation, we also developed C and VHDL models of base station modulator, Rayleigh fading channel, AGC loop in receiving path, and 16-bit 80CI86 microcontroller. Using the above models, we performed the system -level simulation of the modem ASIC by executing an actual operating software. This chip contains 89,000 gates and 29K SRAMs, and the chip size is 10㎜ χ10.1㎜ which is fabricated using a 0.8um 2LM COMS standard-cell technology. The power consumption is about 340 mW in CDMA mode at 10MHz and 33 mW in sleep mode. This ASIC is now successfully working in the CDMA telephone on its first fab-out.